Dolphins have become a popular attraction at zoos in recent years. They are more interesting than lions and tigers because they are livelier and perform tricks, like circus animals. But although they are more willing to cooperate with the trainer than other mammals in captivity, they get bored if they are asked to do the same trick twice. This is one reason for believing that they are very intelligent.

GLOSSARY:

captivity = cativeiro

According to the extract, we conclude that dolphins

Se o triângulo CDE é semelhante ao triângulo ABC, o valor de !$ | a - b | !$ é

Em qual das frases abaixo a palavra ainda não exprime a mesma idéia que em: “No verão passado, eu ainda morava em São Paulo.”?

Considere uma esfera metálica oca com 0,1 m de raio, carregada com 0,01 C de carga elétrica, em equilíbrio eletrostático e com vácuo no seu interior. O valor do campo elétrico em um ponto situado no centro dessa esfera tem intensidade de N/C.

Na Idade Média, os exércitos utilizavam catapultas chamadas “trabucos”. Esses dispositivos eram capazes de lançar projéteis de 2 toneladas e com uma energia cinética inicial igual a 4000 J. A intensidade da velocidade inicial de lançamento, em m/s, vale

Ao calcular !$ \large A^3 _{10} \over C^3 _{10} !$, obtém-se

What makes a good school?

What makes a good school? There are no stock answers, but there are some universal truths. A good school is a community of parents, teachers and students. A good school, like a good class, is run by someone with vision, passion and compassion. A good school has teachers , no matter what their age or experience. A good school prepares its students not just for college entrance tests but also for the world out there.

Choose the correct sentence to have the blank filled.

O inverso do número complexo z = –2i é z’ =